On 23.03.2010, at 08:55, Raph wrote:
> I have tried various hinting methods, but I cannot increase the speed.
> What can I do to make the clojure operations as fast as the native
> Java operations?
Get rid of the reduce and unroll the bit-or computations instead:
(defn arr-to-int [#^ints x]
(bit-or (bit-shift-left (bit-and 0xFF (aget x 0)) 24)
(bit-or (bit-shift-left (bit-and 0xFF (aget x 1)) 16)
(bit-or (bit-shift-left (bit-and 0xFF (aget x 2)) 8)
(bit-and 0xFF (aget x 3))))))
That makes for a factor 3.3 on my machine.
Konrad.
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